Compaq DWZZH Computer Accessories User Manual
Contents
1. O Host Port Host Port SCSI ID 13 SCSI ID 12 SHR 1069 2 3 Narrow Addressing Setting The large Hub can be used with SCSI bus architectures that are limited to eight ID assignments such as DIGITAL UNIX 4 x and earlier versions Figure 2 2 shows narrow ID assignments The jumper on the rear of the Hub Figure 2 3 must be closed to make the Hub respond to SCSI IDs 3 0 on the host ports EK DWZZH UG D01 23 DWZZH 16 Bit UltraSCSI Hub Figure 2 2 DWZZH 05 SCSI Narrow ID Assignments Controller Port Host Port Host Port SCSI ID 6 4 SCSI ID 3 SCSI ID 2 EEE gt gt AA _ TI EECA aes Get ea Gi a Cs E E GAS dy EEE O ak OEA F Gal Go Ga Gn Ol Ge Ge Qik ak Gal Ga OCC GOCE ECE OCG ee EA e OOO CC OE COMCEC CCE CCCECE COCEC COE E OOO CCE AE CECCO ECE ECE COE SOC Ce SE Co A ao OF lt lt 5 E E A G AE AOL COCO EGE OOF CIES ANGE CECE E _ _ _ Y COCR ES POLO AEREO EEE ONCE REO SEE ES SR Sae Bal E SE EA A ma Host Port Host Port SCSI ID 1 SCSI ID 0 SHR 1071 2 4 EK DWZZH UG D01 Chapter 2 Using the DWZZH UltraSCSI Hub Figure 2 3 DWZZH 05 SCSI Narrow Addressing Jumper2. g W1 To enable narrow addressing mode install a jumper at W1 EK DWZZH UG D01 2 5 DWZZH 16 Bit UltraSCSI Hub 2 4 Front Panel Figure 2 4 shows the location of the front panel controls and indicators ln Fair Disable Figure 2 4 DWZZH 05 Front Panel c c c c 2 ie AT ie de Li ae FERI 2 a le NDA be ce e ee EFTS RETE ee be Jo Me A PREY A OO OOO A A Ce Q O CE A COCO ROCCE OCC E CCE A ERE De AP RA A AR AAA O A AA AO al E Ft CCL CPO EEEN CEEE CxO CHC CoC Cr GC CEEE Ce E N D GL O E EEE EA CAE CEEE EET EC ETET EOE E Y CIO Oe E E OCS E e el CLOG CeCe Cee RAS O AE E e ATA EA ADO A A O TA ED H Y Y Q NT GR E E E E E AE A OE GR e E PIERO ASCO AENOR AE ENEE E bh Y I SHR 1070 NOTE The black part of the switch in the diagram indicates the position of the switch 2 4 1 Fair Arb Disable The large Hub contains a switch on the front panel that allows t
3. Cables connected to the DWZZH UltraSCSI Hubs are BN37A and BN38C series Placement of UltraSCSI Hubs UltraSCSI Hubs are available only in SBBs and may be used only within a BA356 StorageWorks shelf or a BA370 StorageWorks shelf The StorageWorks shelves are only used to provide power and cooling for UltraSCSI Hubs An UltraSCSI Hub and I O devices may share the same storage shelf Maximum combinations of UltraSCSI Hubs and disk drives within a single shelf and with dual power supplies are listed in Table 2 1 EK DWZZH UG D01 2 7 DWZZH 16 Bit UltraSCSI Hub Table 2 1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves Number of Number of Small Hubs Large Hubs Number of Personality DWZZH 03 21 Disk Drives Module Installed 5 los installed o notinstaled 1 Installed 2 8 EK DWZZH UG D01 3 SWCC and UltraSCSI Hubs This chapter is intended to provide you with important information regarding the use of StorageWorks Command Console on SCSI buses that have an UltraSCSI Hub While the information provided here is important it is essential that you have read the SWCC Manual and Release Notes 3 1 Agents and Storage It is highly recommended that you only run one SWCC agent on one of the servers that can access a particular storage subsystem behind the DS DWZZH 05 UltraSCSI Hub Using SWCC through the client agent model is very similar to using a serial terminal to access the HSZ70 controller ru
4. 5 SBB Hubs and 5 25 SBB Hubs 1 2 1 DWZZH 3 5 SBB Hubs The DWZZH small UltraSCSI Hub Figure 1 1 comes in two versions e DW2ZZH 21 contains two single ended UltraSCSI connectors and one differential UltraSCSI connector Figure 1 2 illustrates the front panel e DW2ZZH 03 contains three differential UltraSCSI connectors Figure 1 3 illustrates the front panel CAUTION Connecting a differential bus cable to the single ended connector or a single ended bus cable to the differential connector causes the SCSI bus to fail Figure 1 1 DWZZH 21 or DWZZH 03 3 5 SBB Hub SBBHUB 01 1 2 EK DWZZH UG D01 Chapter 1 Introducing the DWZZH UltraSCSI Hub Figure 1 2 DWZZH 21 Front Panel 7 I SBBHUB 02 NOTE The single ended symbol with the downward pointing diamond in Figure 1 2 indicates that the lower two connectors are single ended UltraSCSI connections while the differential symbol with the right pointing diamond indicates that the top connector is a differential UltraSCSI connector Figure 1 3 DWZZH 03 Front Panel e I I SBBHUB 03 NOTE The differential symbol in Figure 1 3 indicates that the three connectors are differential UltraSCSI connectors EK DWZZH UG D01 1 3 DWZZH 16
5. and Trademark Office UNIX is a registered trademark in the United States and other countries exclusively through X Open Company Ltd Windows NT is a registered trademark of the Microsoft Corporation Sun is a registered trademark of Sun Microsystems Inc Hewlett Packard TACHYON and HP UX are registered trademarks of the Hewlett Packard Company IBM and AIX are registered trademarks of International Business Machines Corporation All other trademarks and registered trademarks are the property of their respective owners This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the manuals may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Restrictions apply to the use of the local connection port on this series of controllers failure to observe these restrictions may result in harmful interference Always disconnect this port as soon as possible after completing the setup operation Any changes or modifications made to this equipmen
6. Bit UltraSCSI Hub 1 2 2 DWZZH 5 25 SBB Hubs The DWZZH large UltraSCSI Hub Figure 1 4 comes in a single version that contains five differential UltraSCSI bus connectors CAUTION Connecting a single ended bus cable to any differential connector causes the SCSI bus to fail Figure 1 4 DWZZH 05 5 25 SBB Hub 1 2 3 SCSI Bus Components To install a DWZZH UltraSCSI Hub you will need BN37A and BN38C series SCSI cables Refer to the StorageWorks UltraSCSI Configuration Guidelines EK ULTRA GG for a complete list of the available cables 14 EK DWZZH UG D01 Chapter 1 Introducing the DWZZH UltraSCSI Hub 13 Product Specifications Table 1 1 lists the functional specifications for the DWZZH Hub Table 1 1 DWZZH Hub Functional Specifications Feature SCSI ID The small UltraSCSI HUB does not use a SCSI ID SCSI Addresses The large UltraSCSI HUB uses SCSI ID 7 for arbitration Overload Protection TERMPOWER is not supplied to the external ports DTERMPOWER of the UltraSCSI HUB Internal TERMPOWER is STERMPOWER protected via a resetable fuse TERMPOWER must be supplied from the remote connection to enable each HUB port Enclosure amp Connectors Shielded for ESD EMI and safety requirements Power Up Reset Automatically clears e Initiator detection circuit e Target detection circuit e _ BSY glitch filter SCSI Bus Reset Automatically clears e Initiator detection circuit e Target detection circuit e BSY glitch fi
7. COMPAQ STORAGEWORKS DWZZH 16 Bit UltraSCSI Hub User s Guide EK DWZZH UG D01 Compaq Computer Corporation Fourth Edition November 1998 While Compaq Computer Corporation believes the information included in this manual is correct as of the date of publication it is subject to change without notice Compaq makes no representations that the interconnection of its products in the manner described in this document will not infringe existing or future patent rights nor do the descriptions contained in this document imply the granting of licenses to make use or sell equipment or software in accordance with the description No responsibility is assumed for the use or reliability of firmware on equipment not supplied by Compaq or its affiliated companies Possession use or copying of the software or firmware described in this documentation is authorized only pursuant to a valid written license from Compaq an authorized sublicensor or the identified licensor Commercial Computer Software Computer Software Documentation and Technical Data for Commercial Items are licensed to the U S Government with Compaq s standard commercial license and when applicable the rights in DFAR 252 227 7015 Technical Data Commercial Items 1998 Compaq Computer Corporation All rights reserved Printed in U S A Compaq the Compaq logo DIGITAL DIGITAL UNIX DECconnect HSZ HSG StorageWorks VMS OpenVMS Registered in the United States Patent
8. StorageWorks and SCSI bus components Support and Services Who to contact in the Americas Information and Product Questions Local Sales Office StorageWorks Hotline 1 800 786 7967 Installation Support Contact the Compaq Distributor where the Storage Solution was Purchased Local Compaq Sales Office Compaq Multivendor Customer Service MCS Installation Contact the Compaq Customer Support Center CSC Warranty Contact the Compaq Customer Support Center CSC for warranty service after solution is installed and operating Remedial Contact the Compaq Customer Support Center CSC Note A Service Contract is recommended when the equipment is out of warranty Contact the local Compaq Sales Office Customer Support Center CSC 1 800 354 9000 x EK DWZZH UG D01 Who to contact in Europe Information and Product Questions Installation Support and Installation For Warranty Service For Remedial Service Who to contact in Asia Pacific About This Guide Contact the Compag Distributor or reseller from whom the Storage Solution was purchased See the Warranty Card packaged with the product Contact the Compag Distributor or reseller from whom the Storage Solution was purchased Note A Service Contract is recommended when the equipment is out of warranty For all services contact the Compaq Distributor or reseller from whom the equipment was purchased EK DWZZH UG D01 xi 1 Introducing th
9. You should be familiar with the information contained in the following documentation Document Title Order Number Storage Works Solutions Configuration Guide EK BA350 CG Storage Works Solutions Shelf and SBB User s Guide EK BA350 UG StorageWorks SBB Shelf I O Modules EK SBBIO UG StorageWorks UltraSCSI Configuration Guidelines EK ULTRA CG Storage Works Solutions BA356 SB 16 bit Shelf User s Guide EK BA356 UG Shared Storage Solutions Using UltraSCSI Hubs EK SMA21 AN Shared Storage for Windows NT Using UltraSCSI Hubs EK SMA 17 AN Shared Storage for DIGITAL OpenVMS Using UltraSCSI Hubs EK SMA19 AN Shared Storage for DIGITAL UNIX Using UltraSCSI Hubs EK SMA20 AN EK DWZZH UG D01 ix DWZZH 16 Bit UltraSCSI Hub Document Structure This guide contains the following chapters Chapter 1 Introducing the DWZZH UltraSCSI Hub This chapter gives brief functional and physical descriptions of the DWZZH Hub and lists significant product specifications Chapter 2 Using the DWZZH UltraSCSI Hub This chapter gives the procedures for configuring a StorageWorks SCSI bus using a DWZZH Hub Chapter 3 SWCC and UltraSCSI Hubs This chapter provides important information concerning the use of StorageWorks Command Console SWCC on SCSI buses that have an UltraSCSI hub While the information provided here is important it is essential that you have read the SWCC manual and release notes Glossary The Glossary defines terms that are used frequently with
10. e DWZZH UltraSCSI Hub This chapter describes the DWZZH Hub functions and available versions and list the Hub functional specifications The series of DWZZH Hubs are SCSI 2 and draft SCSI 3 ANSI X379 2 91 10R3 compliant 16 bit converters capable of data transfer rates of up to 40 Mbytes per second The series of Hubs consists of the following e DWZZH 21 and DWZZH 03 are 3 5 SBB small Hubs the DWZZH 21 contains two single ended and one differential UltraSCSI ports while the DW2ZZH 03 contains three differential UltraSCSI ports e DW2ZZH 05 is a 5 25 SBB large Hub that contains 5 differential UltraSCSI ports 1 1 UltraSCSI Hub Functions Most device SCSI buses are either 8 bit or 16 bit single ended physical buses Some controllers and hosts use differential buses and others use a single ended bus Single ended and differential physical buses are not compatible The SCSI protocol disables both buses when they are connected together However by using an UltraSCSI Hub you can accomplish the following e Connect a differential physical bus to a single ended physical bus DWZZH 21 UltraSCSI Hub only e Extend the maximum length of a SCSI bus e Provide radial disconnect where remaining connections can continue to operate e Provide fair SCSI arbitration for host nodes DWZZH 05 UltraSCSI HUB only EK DWZZH UG D01 1 1 DWZZH 16 Bit UltraSCSI Hub 1 2 Product Descriptions There are two classes of DWZZH Hubs 3
11. e is the discharge of a potentially harmful static electric voltage as a result of improper grounding host The primary or controlling computer or any such unit in a multiple computer network to which storage is attached EK DWZZH UG D01 Glossary 1 DWZZH 16 UltraSCSI Hub host adapter A device that connects the host system I O bus for example a PCI bus to the storage SCSI bus A host adapter performs the lower layers of the SCSI protocol and normally operates in the initiator role initiator A SCSI device that requests another device on the bus to perform an operation Any device on the bus can be an initiator or a target logical bus A single ended or differential physical bus connected to a differential physical bus by a SCSI bus converter personality module The BA356 module that interfaces the SCSI bus to the BA356 shelf physical bus Two SCSI terminators separated by cables connectors and or the backplane circuitry SBB StorageWorks building block The basic building block of the StorageWorks product line Any device conforming to shelf mechanical and electrical standards installed in either a 3 inch or 5 inch carrier is considered to be an SBB whether it is a storage device a power supply or other device SBB shelf The common name for any StorageWorks shelf that contains only power supply and storage SBBs SCSI Small Computer System Interface This ANSI interface defines the physical and elec
12. he user to disable the FAIR ARB feature of the Hub When FAIR ARB is disabled the Hub services SCSI arbitration cycles in the conventional SCSI priority order Host port SCSI ID assignments are not linked to the physical port location in the Hub when FAIR ARB is disabled EK DWZZH UG D01 2 5 2 6 2 7 Chapter 2 Using the DWZZH UltraSCSI Hub 2 4 2 Indicators The large Hub has two indicators on the front panel The green LED indicates that POWER is applied to the Hub while the yellow LED indicates that the SCSI bus is BUSY Determining the Configuration The UltraSCSI Hub is used in end bus SCSI bus configurations only The SCSI bus segments require TERMPOWER supplied from the remote connection to enable the UltraSCSI Hub port for that segment Each port on the UltraSCSI Hub has its own terminators All SCSI buses are terminated at the physical ends of the bus This is true even when using a DWZZH UltraSCSI Hub DWZZH UltraSCSI Hubs are factory set to terminate the SCSI bus No user configuration of the SCSI terminators is required Selecting the SCSI Cables The StorageWorks UltraSCSI Configuration Guidelines EK ULTRA CG describes SCSI cables in detail When selecting a cable you must consider the cable connector clearance Be sure to determine the type connector compatible with the controller connector In some cases you must use a right angle connector because there is not enough clearance to use a straight connector
13. hub Change SCSI to UltraSCST throughout Add documents to list of Related Documents Modify Figure 1 3 Add installation recommendation in introduction to Chapter 2 Add Section 2 6 Placement of UltraSCSI Hubs Add Chapter 3 SWCC and UltraSCSI Hubs Add Glossary entries vil DWZZH 16 Bit UltraSCSI Hub EK DWZZH UG D01 October 1998 Change Section 2 1 add CAUTION after Section 2 1 Make minor changes to Section 2 3 3 renumber Section 2 3 3 as Section 2 3 Renumber Sections 2 3 2 4 2 5 and 2 6 as 2 4 2 5 2 6 and 2 7 respectively Vili EK DWZZH UG D01 About This Guide This chapter tells you what this User s Guide does identifies the audience describes the structure and contents chapter by chapter briefly and tells you how to get support and services from Compaq This User s Guide describes the purpose function operation and use of the DWZZH UltraSCSI Hub the DWZZH Hub or the Hub The DWZZH Hub allows the connection of up to five ports on one logical SCSI bus Visit our Web Site for the Latest Information Check our web site for the latest drivers technical tips and documentation We can be found in the technical area of our web page http www storage digital com Audience This guide is intended for end users and for Compaq employees responsible for configuring installing and maintaining the Storage Works subsystem and its components Related Documentation
14. ined by the assignment in each configuration CAUTION Running the UltraSCSI Hub under heavy I O with Fair Arbritration disabled might result in SCSI Bus starvation for hosts with lower SCSI IDs Large Hub Addressing Configurations The large UltraSCSI Hub has a specific SCSI ID configuration The SCSI IDs are assigned to specific physical locations in the Hub This allows the fair arbitration logic in the Hub to correctly identify the SCSI IDs that are participating in a fair arbitration cycle CAUTION The SCSI ID of each host adapter must correspond to the assigned SCSI ID of the host port to which the host adapter is connected Mismatched SCSI IDs will cause the SCSI bus to hang Figure 2 1 shows the physical layout of the ports and their associated SCSI ID assignments EK DWZZH UG D01 Chapter 2 Using the DWZZH UltraSCSI Hub Figure 2 1 DWZZH 05 SCSI ID Assignments Controller Port Host Port Host Port SCSI ID 6 0 SCSI ID 15 SCSIID 14 a FER EEA EEE ETF EE EE E eA Ty FO COG TA OHO EC E Hecccceccecccocorcccccccccccocrpocco E EE SCE CCCEOCCECE CC COECCOE CECE CE COC CE E WVCeCCeC CCC CCC CECL ECECECEEC CE E Ce Or Qi Pa OO COC COC CE OE COOECEC ETICA CETE E _ _ _ _ _ _ _ _ Y CECE IE I E CIC ERA CCIE EEC NG Clee T ECETIA iE 6 GEC CoCo EG ewe ED YH Y MANS AU E E AE GG ON IE Gee CEECEE CCG OG CG CC ChE EC Ee Y
15. ion algorithm The normal SCSI arbitration scheme is based on the SCSI ID The highest priority SCSI ID will always win arbitration This could have the effect of starving lower priority SCSI ID requests on the bus SCSI ID 7 is RESERVED and may not be assigned to any SCSI device connected to the UltraSCSI Hub whether FairARB is enabled or disabled In order to allow up to four host SCSI IDs to participate on a single SCSI bus a fair arbitration fair arb scheme is employed Fair arb works by assigning SCSI ID 7 the highest priority ID to the Hub When a SCSI arbitration phase occurs all the arbitrating IDs are captured in a register The winning ID for this group will be the highest priority ID After this ID has been serviced the ID will be EK DWZZH UG D01 2 1 DWZZH 16 Bit UltraSCSI Hub 2 2 removed from the group and at the next arbitration phase the remaining highest ID will be serviced This will continue until all of the IDs in the group have been serviced once All requests from IDs not contained in the register will be backed off using ID 7 CAUTION Most manufacturers ship host bus adapters with a default SCSI ID of 7 Ensure that the ID is changed BEFORE you establish a connection between the adapter and the Hub After all the IDs in the group have been serviced a new group of IDs will be captured at the next arbitration phase The fair arbitration algorithm only applies to host port SCSI IDs as def
16. lded SCSI cables 1 6 EK DWZZH UG D01 2 Using the DWZZH UltraSCSI Hub This chapter discusses fair arbitration of the SCSI bus by the 5 25 SBB Hub describes addressing configurations tells you how to use the large Hub front panel and gives guidelines for selecting the SCSI cables 2 1 UltraSCSI Configuration guidelines are documented in EK ULTRA CG These guidelines include a list of all UltraSCSI components and the last few example configurations include an UltraSCSI Hub Refer to the configuration guidelines for bus length and SCSI bus data transmission rates The UltraSCSI Hubs are designed to be installed in a StorageWorks Solutions BA356 Shelf or in a StorageWorks BA370 shelf The small UltraSCSI Hub can be installed in any open SBB slot The large UltraSCSI Hub can be installed in any slots that will accommodate a 5 25 SBB When installing UltraSCSI Hubs in a BA370 shelf it is recommended that UltraSCSI Hubs be installed in the lower right hand device slots of the shelf to allow better clearance for hot swapping of disk drives installed in the BA370 shelf The small UltraSCSI Hub does not consume a SCSI ID and uses the shelf only to provide its power and mechanical support The large UltraSCSI Hub uses SCSI ID 7 to control the fair arbitration of the host port IDs and uses the shelf only to provide its power and mechanical support Large Hub Fair Arbitration The large Hub configurations utilize a modified SCSI arbitrat
17. lter Single Ended SCSI Bus 20 meters 66 feet per segment Length Ultra 20 megatransfers per second or 40 MB s Differential SCSI Bus Length 25 meters 82 feet per segment Data Timing The relationship between the data and the control signals is brought to SCSI compatibility before transmission to the other SCSI bus High reliability SMT EK DWZZH UG D01 1 5 DWZZH 16 Bit UltraSCSI Hub Table 1 1 DWZZH Hub Functional Specifications Cont d Specification Cable Fault DIFFSENSE support and port disable on cable fault Glitch Elimination 100 glitch free operation during power up BUSY GLITCH trap eliminates cable length constraint due to wired OR glitches on the BSY line Termination Singled ended Differential Service There are no user servicable functions on these products Contact Digital service personnel all service Agency Approvals UL CSA FCC Class B TUV Environmental Specifications Relative Humidity 10 to 85 non condensing Operating Temperature 10 C to 40 C 50 F to 104 F Storage Temperature non 40 C to 66 C 40 F to 151 F operating Power Requirements 5V Input Current DWZZH 03 DWZZH 05 DWZZH 21 Supplied to internal terminators only SCSI Connectors and Cables Single Ended Differential Cables Active termination for 16bit operation Termination for 16bit operation Board mounted 68pin VHDCI SCSI connector Board mounted 68pin VHDCI SCSI connector BN37A and BN38C series shie
18. n access everything in the storage subsystem regardless of HSZ70 access ID restrictions For further information on setting up and configuring agents on HSZ controllers please see the SWCC and controller documentation 3 2 EK DWZZH UG D01 Chapter3 SWCC and UltraSCSI Hubs Figure 3 1 Running One SWCC Agent for a Particular Storage Subsystem BA370 Cabinet with HSZ70 Controllers Host System EK DWZZH UG D01 3 3 Glossary This Glossary includes an alphabetized listing and brief definition of the abbreviations acronyms Compaq specific references and other technical terms that are used in this manual and that may be unfamiliar to the reader adapter See SCSI bus converter building block shelf See SBB shelf controller A hardware firmware device that manages communications on behalf of host systems over the SCSI bus to devices such as the HSC series HSJ series and HSZ series controllers Controllers typically differ by the type of interface to the host and provide functions beyond what the devices support differential SCSI bus A signal s level is determined by the potential difference between two wires A differential bus is more robust and less subject to electrical noise than is a single ended bus DWZZC A StorageWorks compatible 16 bit UltraSCSI bus converter See SCSI bus converter DWZZH A StorageWorks compatible 16 bit UltraSCSI bus HUB electrostatic discharge See ESD ESD Electrostatic discharg
19. nning multiple agents to access one storage subsystem would show up as multiple storage windows on the SWCC Client machine This could be a potential problem as the Client would see multiple HSZ70 subsystems when in fact only one exists but is being displayed multiple times NOTE If you have multiple storage subsystems behind the DWZZH UltraSCSI Hub be sure to name each of your storage subsystems uniquely and carefully when you configure SWCC so that you can distinguish between them easily The SWCC Graphical User Interface GUI neither displays when HSZ access ID restriction is being enforced nor prevents changes to restricted configurations from the GUI For example consider having four servers each with a uniquely identified Host Bus Adapter attached to a DWZZH 5 port UltraSCSI Hub connected to an RA7000 subsystem Figure 3 1 Furthermore consider the case where you have access ID restrictions configured such that each SCSI ID 12 15 could access a unique set of six disks in the storage cabinet EK DWZZH UG D01 3 1 DWZZH 16 Bit UltraSCSI HUB This type of configuration would prevent systems with different SCSI IDs from accessing disks belonging to a particular SCSI ID which promotes data security between servers on a shared SCSI bus however it does not prevent SWCC from performing tasks on those disks In other words if you set up the SWCC client to have configuration capability see SWCC documentation then you ca
20. ows customers to design and configure their own storage subsystem Components include power packaging and interconnections in a StorageWorks shelf SBBs and array controllers are integrated therein to form level enclosures to house the shelves Standard mounting devices for SBBs are also included StorageWorks building block See SBB target A SCSI device that performs an operation requested by an initiator Any device on the bus can be an initiator or a target target ID See SCSI device ID terminators The interconnect components that form the ends of the transmission lines in bus segments A SCSI domain must have at least one segment and therefore at least two terminators The terminators ensure that inactive SCSI bus signals are in a known state There are two basic types of terminators active and passive e Single ended bus segments use active linear terminators e Differential bus segments use passive linear totem pole terminators except for special cases where the electrical transmission lines are very short and only one termination or pull up is required termpower An electrical current that is limited by self resetting fuses EK DWZZH UG D01 Glossary 3 DWZZH 16 UltraSCSI Hub UltraSCSI An improvement in SCSI technology invented in 1993 by the Compaq Computer Corporation StorageWorks Engineering Group Subsequently the ANSI SCSI Standards Committee issued standard X3T10 for UltraSCSI The UltraSCSI improvemen
21. quipment under part 15 of the FCC rules Contents Revisi n Record ossos pce tri dir vii ADOUE This Guide oir ix 1 Introducing the DWZZH UltraSCSI Hub 1 1 UltraSEST Hub Functional iaa 1 1 1 27 o A RA 1 2 1 2 1 DWZZH 375 SBB HUDS ua ITA ITA savers 1 2 1 2 2 DWZZH 5 25 SBB UDS isc iia 1 4 1 2 3 SEST B s COMpon ntS ai 1 4 1 3 Product Sp cifications viii aan May eed Nat 1 5 2 Using the DWZZH UltraSCSI Hub 2 1 Large Hub Fair Arbitration cece eecsceceeeceeeesceeceneeceeaeeceeeeceeeeeesaeeeeseeesstaeeeesaes 2 1 2 2 Large Hub Addressing Configurations o ooonoccnonononcnonononcnnonononnonnnonononn nana ncnnccnnnonns 2 2 2 3 Narrow Addressing Setting nesenie aaa a cnn cnnn nono n crac cnn S ie 2 3 ZA Front A RAN 2 6 2 4 1 Fair Arb Disable Ai 2 6 2 4 2 TICO AA PUR RN ee Re 2 7 2 5 Determining the Configuration ee ee eesceeeccseessneceeceeesseessaeeeaeeeseeesseseaeeesees 2 7 2 6 Selecting the SCSI Cables scission ais 2 7 Placement of UltlraSCSI Hubs 3 SWCC and UltraSCSI Bubs ccscicsevssssssscsnsovsevvessensevnsesnssdennsonvdosndosiiins 3 1 Glossary Figures 1 1 DWZZH 21 or DWZZH 03 3 5 SBB Hub 1 2 DWZZH 21 Front Panel inoicodinsi diodos dovsustscencaodedececcdovczeacGoderecosvicsides odesadebident 123 DWZZH 03Eront Panel ranas 1 4 DWZZH 05 5 25 SBB Hub eee eeceeccssecseesseesseeseessecseeeseesseeeeeseesaeeseesaeeeeeeaeenss 2 1 DWZZH 053 SCSI ID Assignment 0 cece eesccereceseeceeeesseeeseeceeecsseees
22. sesesaeseaees 2 2 DWZZH 05 SCSI Narrow ID Assignment oooconcocnononooncnnoncnoncnnnnononcnnnn ccoo coran caninos 2 4 2 3 DWZZH 05 SCSI Narrow Addressing Jumper ooooonoconnoncnonnconancnonononnconn conocio nan ncninnos 2 5 2 4 DWZZH 05 SCSI Front Panel cuco a e E 2 6 EK DWZZH UG D01 v DWZZH 16 Bit UltraSCSI Hub Figures Cont d 3 1 Running One SWCC Agent for a Particular Storage Subsystem 00 0 ee eee 33 Tables 1 1 DWZZH Hub Functional SpecificatiONS oconnonnncononinocononanoncnonncnnncnnncnoncnn nono nonancnnno 1 5 2 1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves 2 8 vi EK DWZZH UG D01 Revision Record The Revision Record provides a concise publication history of this guide It lists the guide revision levels and release dates and summarizes the changes The following revision history lists all revisions of this publication and their effective dates The publication part number is included in the Revision Level column with the last entry denoting the latest revision This publication supports the DWZZH 16 Bit UltraSCSI Hub Revision Level Date EK DWZZH UG A01 October 1997 EK DWZZH UG B01 April 1998 EK DWZZH UG C01 July 1998 EK DWZZH UG D01 Summary of Changes Original Release Change title page Add Section 1 2 2 describing DW2ZZH 05 Hub Change Chapter 2 title from Installing to Using and add procedures for configuring a SCSI bus using a DWZZH
23. t may void the user s authority to operate the equipment Warning This is a Class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Achtung Dieses ist ein Ger t der Funkst rgrenzwertklasse A In Wohnbereichen k nnen bei Betrieb dieses Ger tes Rundfunkst rungen auftreten in welchen Fallen der Benutzer fiir entsprechende Gegenma nahmen verantwortlich ist Attention Ceci est un produit de Classe A Dans un environnement domestique ce produit risque de cr er des interf rences radio lectriques il appartiendra alors l utilisateur de prendre les mesures sp cifiques appropri es JAPAN TORE AURRE SERERA EMAAR VCCI Oe KETSA A AEREA RETO COREA SERE TRATO MEEVNRRIOTCEMAVET CORRA AAA ARAS DEFTERENDLEPID ES USA This equipment generates uses and may emit radio frequency energy The equipment has been type tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of FCC rules which are designed to provide reasonable protection against such radio frequency interference Operation of this equipment in a residential area may cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference Any modifications to this device unless expressly approved by the manufacturer can void the user s authority to operate this e
24. trical parameters of a parallel I O bus used to connect computers and devices The StorageWorks subsystem implementation uses SCSI 2 or SCSI 3 for the transfer of data SCSI bus converter Sometimes referred to as an adapter 1 A connecting device that permits the attachment of accessories or provides the capability to mount or link units 2 The device that connects a differential SCSI bus to a single ended SCSI bus SCSI device A host computer adapter a peripheral controller or an intelligent peripheral that can be attached to the SCSI bus SCSI device ID The bit significant representation of the SCSI addressing referring to one of the signal lines numbered 0 through 15 Also referred to as target ID For example SCSI device ID 1 would be represented as 00001 Glossary 2 EK DWZZH UG D01 Glossay SCSI end bus position The physical location of a controller or a device that contains the SCSI bus termination SCSI mid bus position The physical location of a controller or a device that the SCSI bus passes through enroute to the controller or device that contains the SCSI bus termination SCSI cable A 68 conductor 34 twisted pairs cable used for differential bus connections single ended SCSI bus A bus in which each signal s logic level is determined by the voltage of a single wire in relation to ground Small Computer System Interface See SCSI StorageWorks The Digital set of enclosure products that all
25. ts over Fast SCSI include the following e Maximum transfer rate increases from 10 MHz to 20 MHz VHDCI Very High Density Cable Interconnect Glossary 4 EK DWZZH UG D01
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